AD7688是一款16位、500 kSPS、电荷再分配、逐次逼近型模数转换器（ADC）,采用5 V单电源（VDD）供电。该器件内置一个极低功耗、高速、16位无失码采样ADC、一个内部转换时钟和一个多功能串行接口端口,还集成了一个低噪声、宽带宽、极短孔径延迟的采样保持电路。在CNV上升沿,该器件对IN+与IN-引脚之间的电压差进行采样。这两个引脚上的电压摆幅通常在0 V至REF之间、相位相反。基准电压（REF）由外部提供,最高可设置为电源电压。功耗和吞吐量呈线性变化关系。
SPI兼容串行接口还能够利用SDI输入,将几个ADC以菊花链形式连结到单三线式总线上,并提供一个可选的忙闲指示。采用独立电源VIO时,该器件与1.8V、2.5V、3V或5V逻辑兼容。AD7688采用10引脚μSOIC封装或10引脚QFN封装（CSP芯片级封装）,工作温度范围为-40°C至+85°C。
The AD7688 is a 16-bit, 500 kSPS, charge redistribution successive-approximation Analog-to-Digital Converter which operates from a single 5V power supply, VDD. It contains a very low power high-speed 16-bit sampling ADC with no missing codes, an internal conversion clock and a versatile serial interface port. The part also contains a low noise, wide bandwidth, very short aperture delay track/hold circuit. On the CNV rising edge, it samples the voltage difference between IN+ and IN- pins. The voltages on these pins usually swing in opposite phase between 0 V to REF. The reference voltage REF is applied externally and can be set up to the supply voltage.Its power scales linearly with throughput.
The SPI compatible serial interface also features the ability, using the SDI input, to “Daisy chain” several ADCs on a single 3 wire bus and provides an optional Busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V or 5 V logic using the separate supply VIO.The AD7688 is housed in a 10-lead μSOIC or 10-lead QFN (Chip Scale package) with operation
产品应用领域 Applications
电池供电设备
医疗仪器
移动通信
个人数字助理
数据采集
仪器仪表
医疗仪器
过程控制
产品应用领域 Applications
Battery Powered Equipment
Medical instruments
Mobile communications
Personal digital assistants
Data Acquisition
Instrumentation
Medical Instruments
Process Control
AD7688BRMZ 特点
16位分辨率、16位无失码
吞吐量：500 kSPS
积分非线性（INL）：±0.4 LSB（典型值）,±1.5 LSB（最大值）
S/(N+D): 95 dB @ 20 kHz
功耗：
4 mW @ 100 kSPS
4 μW @ 100 SPS
真差分模拟输入范围： ±VREF 0 V ～ VREF （两个输入脚的VREF 最高为VDD）
无流水线延迟
单电源工作：5 V,逻辑接口电压1.8 V至5 V
多个ADC以菊花链形式联接、且提供忙闲指示功能
串行接口：SPI/QSPI/Wire/DSP兼容
μSOIC封装（μSO8尺寸）和3 mm x 3 mm QFN封装（LFCSP）（SOT23尺寸）
与AD7685、AD7686、AD7687引脚兼容
16 Bits Resolution with No Missing 16-Bit Codes
Throughput: 500 kSPS
INL: ±0.4 LSB Typ, ±1.5 LSB Max
S/(N+D): 95 dB @ 20 kHz
Power Dissipation:
4 mW @ 100 kSPS
4 μW @ 100 SPS
True Differential Analog input range: ±VREF 0 V to VREF with VREF up to VDD on Both Inputs
No Pipeline Delay
Single Supply 5V Operation with 1.8V to 5 V Logic Interface
Multiple ADCs Daisy Chain, with BUSY Indicator
Serial Interface SPI/QSPI/Wire/DSP compatible
μSOIC Package (μSO8 Size) and 3 mm by 3 mm QFN (LFCSP) (SOT23 size)
Pin-to-Pin Compatible with the AD7685, AD7686, AD7687
深圳市腾迅辉电子科技有限公司
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深圳市腾迅辉电子科技有限公司
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